CN111505420A - Online monitoring and diagnosing method and system for state of line arrester - Google Patents
Online monitoring and diagnosing method and system for state of line arrester Download PDFInfo
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Abstract
The invention discloses a method and a system for online monitoring and diagnosing the state of a line arrester, wherein the method comprises the following steps: obtaining a fundamental voltage characteristic curve of the line arrester through an experiment; acquiring an ambient temperature characteristic curve cluster of the line arrester through an experiment; monitoring and measuring the total leakage current and the ambient temperature of the online operating line arrester to obtain fundamental current and third harmonic current; obtaining three corresponding curves from the environmental temperature characteristic curve cluster according to the environmental temperature; obtaining asynchronous measurement voltage of a corresponding line on the transformer substation side, and further obtaining third harmonic current amplitude; calculating resistive current components of fundamental waves and third harmonics; and setting a criterion variable and a threshold value thereof and diagnosing the running state of the line arrester. The lightning arrester state diagnosis method utilizes a voltage and current asynchronous sampling technology, comprehensively considers the influence of voltage harmonic waves and temperature, and can be combined with a small amount of experimental data to diagnose the state of the lightning arrester.
Description
Technical Field
The invention belongs to the technical field of lightning arrester state monitoring and diagnosis, and particularly relates to an online monitoring and diagnosis method and system for the state of a line lightning arrester.
Background
The line arrester can effectively restrain lightning overvoltage or operation overvoltage from being transmitted along a lead and invading a transformer substation. At present, the commonly used line arrester comprises a gapless zinc oxide arrester, which is composed of a zinc oxide valve plate and an external insulation accessory connected in series and parallel. The operating state of the line arrester can be reflected by the leakage current of the zinc oxide valve plate or the resistive component thereof. However, the leakage current of the valve plate is only a small component of the total leakage current of the lightning arrester, and the total leakage current is related to the structure of the lightning arrester and the voltage of a power grid and is influenced by environmental factors, so that the measurement and calculation results of the leakage current of the valve plate are easy to have larger deviation.
At present, there are three typical methods for assessing the state of an arrester, limited by conditions:
firstly, synchronously sampling leakage current and grid voltage, compensating capacitive current components and obtaining resistive components;
secondly, voltage is not collected, and harmonic components of leakage current are extracted through Fourier transform and are used as judgment basis;
thirdly, comparing the full current real-time data with the measurement data in the laboratory without collecting voltage, and judging according to the comparison result;
the first method has high requirements on the performance of the voltage and current acquisition device and high equipment cost; the second method is easily affected by the voltage harmonic wave of the power grid and has low accuracy; the third method is difficult to establish a comprehensive experimental database because of the difference of characteristic curves of different lightning arresters, and has poor practicability.
In view of the foregoing, a need exists for a new method and system for online monitoring and diagnosing the status of a line arrester.
Disclosure of Invention
The present invention is directed to a method and system for online monitoring and diagnosing the status of a line arrester, so as to solve one or more of the above-mentioned problems. The lightning arrester state diagnosis method utilizes a voltage and current asynchronous sampling technology, comprehensively considers the influence of voltage harmonic waves and temperature, and can be combined with a small amount of experimental data to diagnose the state of the lightning arrester.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an online monitoring and diagnosing method for the state of a line arrester, which comprises the following steps:
step 1, acquiring a fundamental voltage characteristic curve of a line arrester through an experiment; the fundamental voltage characteristic curve includes: a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve;
step 2, acquiring an ambient temperature characteristic curve cluster of the line arrester through an experiment;
step 3, monitoring and measuring the total leakage current and the ambient temperature of the online operating line arrester, performing Fourier decomposition on the total leakage current to obtain fundamental wave current and third harmonic current with amplitudes I1mAnd I3m；
Step 4, obtaining a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve from the environmental temperature characteristic curve cluster in the step 2 in a line interpolation mode according to the environmental temperature in the step 3;
step 5, obtaining the asynchronous measurement voltage of the corresponding line on the transformer substation side, comprising: fundamental voltage amplitude U1mAnd third harmonic voltage amplitude U3m(ii) a According to fundamental voltage amplitude U1mRespectively obtaining a third harmonic current amplitude I by linear interpolation from the voltage amplitude and third harmonic current amplitude curve, the voltage amplitude and voltage in-phase fundamental current amplitude curve and the voltage amplitude and voltage vertical fundamental current amplitude curve obtained in the step 43m_r、I1m_r、I1m_c；
Step 6, calculating resistive current components of fundamental waves and third harmonics by using the 5 current amplitudes obtained in the step 3 and the step 5; wherein, the fundamental wave resistive current component I'1m_rThe calculation expression of (a) is:
third harmonic resistive current component I'3m_rThe calculation expression of (a) is:
I'3m_r＝|I3m-3·I1m_c·U3m/U1m|；
step 7, setting criterion variables and threshold values thereof and diagnosing the operation state of the line arrester; wherein, the expression of the set criterion variable K is as follows:
the invention has the further improvement that the step 1 specifically comprises the following steps:
step 1.1, fundamental voltage is applied to a line arrester, and voltage and total leakage current are synchronously measured;
step 1.2, carrying out Fourier decomposition on the full leakage current to obtain fundamental current and third harmonic current;
and 1.3, decomposing the fundamental wave current into voltage in-phase fundamental wave current and voltage vertical fundamental wave current to obtain a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage in-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
A further development of the invention is that in step 1.1, the range of variation of the voltage amplitude of the applied fundamental voltage includes the range of variation of the voltage amplitude allowed by the grid voltage.
The invention has the further improvement that the step 2 specifically comprises the following steps:
selecting a plurality of temperature point values within the temperature range of the line operation environment, setting the experiment environment temperature as the selected temperature point values, and repeatedly executing the step 1 to obtain an environment temperature characteristic curve cluster of a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve.
The invention is further improved in that when a plurality of temperature point values are selected within the temperature range of the operating environment of the circuit, the temperature point values are selected at equal intervals.
In a further development of the invention, in step 7, a criterion variable threshold value is set to K1，K2，K1<K2(ii) a When K is<K1When the line arrester is in a normal state, the line arrester is diagnosed; when K is1≤K<K2Then, the line arrester is diagnosed to be in a fault early warning state; when K is>K2The line arrester is diagnosed as a fault condition.
The invention relates to an on-line monitoring and diagnosing system for the state of a line arrester, which comprises:
the fundamental voltage characteristic curve acquisition module is used for acquiring a fundamental voltage characteristic curve of the line arrester through experiments; the fundamental voltage characteristic curve includes: a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve;
the system comprises an ambient temperature characteristic curve cluster acquisition module, a line arrester and a control module, wherein the ambient temperature characteristic curve cluster acquisition module is used for acquiring an ambient temperature characteristic curve cluster of the line arrester through experiments;
the running state evaluation module is used for monitoring and measuring the total leakage current and the ambient temperature of the line arrester running on line, carrying out Fourier decomposition on the total leakage current to obtain fundamental wave current and third harmonic current, and the amplitudes are I respectively1mAnd I3m(ii) a Obtaining a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve from an ambient temperature characteristic curve cluster according to the monitored and measured ambient temperature in a line interpolation mode; the method for obtaining the asynchronous measurement voltage of the corresponding line on the transformer substation side comprises the following steps: fundamental voltage amplitude U1mAnd third harmonic voltage amplitude U3m(ii) a According to fundamental voltage amplitude U1mRespectively obtaining a third harmonic current amplitude I by linear interpolation from the voltage amplitude and third harmonic current amplitude curve, the voltage amplitude and voltage in-phase fundamental current amplitude curve and the voltage amplitude and voltage vertical fundamental current amplitude curve obtained in the step 43m_r、I1m_r、I1m_c(ii) a Calculating resistive current components of fundamental waves and third harmonics by using the 5 current amplitudes; wherein, the fundamental wave resistive current component I'1m_rThe calculation expression of (a) is:
third harmonic resistive current component I'3m_rThe calculation expression of (a) is:
I'3m_r＝|I3m-3·I1m_c·U3m/U1m|；
setting a criterion variable and a threshold value thereof and diagnosing the running state of the line arrester; wherein, the expression of the set criterion variable K is as follows:
in a further improvement of the present invention, the fundamental voltage characteristic curve acquisition module includes:
the voltage application measurement module is used for applying fundamental voltage to the line arrester and synchronously measuring the voltage and the total leakage current;
the current acquisition module is used for carrying out Fourier decomposition on the full leakage current to obtain fundamental current and third harmonic current;
and the curve acquisition module is used for decomposing the fundamental wave current into voltage in-phase fundamental wave current and voltage vertical fundamental wave current to obtain a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage in-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
In a further refinement of the present invention, the ambient temperature characteristic curve cluster obtaining module includes:
the temperature point value acquisition module is used for selecting a plurality of temperature point values within the temperature range of the line operating environment;
and the curve cluster acquisition module is used for setting the experimental environment temperature as a selected temperature point value, repeatedly executing the fundamental wave voltage characteristic curve acquisition module, and acquiring an environment temperature characteristic curve cluster of a voltage amplitude and third harmonic wave current amplitude curve, a voltage amplitude and voltage same-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
Compared with the prior art, the invention has the following beneficial effects:
(1) the voltage and the current are sampled asynchronously, the two parameters can be acquired at different places by using different devices, synchronous time synchronization equipment is not needed, and the performance requirement on the acquisition device is reduced.
(2) The invention utilizes the voltage to acquire the harmonic component of the signal fire current, reduces the influence of the voltage harmonic of the power grid on the current characteristic component for judging the state of the lightning arrester, and improves the judgment accuracy. Meanwhile, the influence of voltage and environment temperature is considered, and the anti-interference performance of the power grid and the environment under the background of influence is improved.
(3) In the invention, the experimental data for auxiliary judgment is determined, only the fundamental voltage characteristic curve and the environmental temperature characteristic curve cluster are included, a specific test method is provided, the experimental data volume is reduced, and all the experimental data can be obtained by using simple experimental equipment.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic block diagram of a flow of a method for online monitoring and diagnosing a state of a line arrester according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1, an online monitoring and diagnosing method for a line arrester state according to an embodiment of the present invention includes the following steps:
step 1, obtaining a fundamental voltage characteristic curve of a line arrester; fundamental voltage is applied to a newly produced line arrester in a laboratory, the variation range of the voltage amplitude comprises the allowable variation range of the voltage amplitude of the power grid voltage, for example, the variation range is set to be 0.9 times of the power grid voltage amplitude to 1.1 times of the power grid voltage amplitude, and the voltage and the total leakage current are synchronously measured; carrying out Fourier decomposition on the total leakage current to obtain fundamental current and third harmonic current; the fundamental wave current is decomposed into voltage in-phase fundamental wave current and voltage vertical fundamental wave current, and a voltage amplitude-third harmonic current amplitude curve, a voltage amplitude-voltage in-phase fundamental wave current amplitude curve and a voltage amplitude-voltage vertical fundamental wave current amplitude curve are obtained.
Step 2, acquiring an ambient temperature characteristic curve cluster of the line arrester; and (3) selecting a plurality of temperature points at equal intervals within the range of the operating environment temperature of the circuit, sequentially setting the experimental environment temperature as the selected temperature point value, and repeating the step (1) to obtain the environment temperature characteristic curve clusters of the three curves.
And 3, monitoring the total leakage current and the ambient temperature of the line arrester in real time. Measuring the total leakage current and the ambient temperature of the online operating line arrester in real time, performing Fourier decomposition on the total leakage current to obtain fundamental current and third harmonic current, and respectively setting the amplitudes to be I1mAnd I3m。
And 4, obtaining a voltage amplitude-third harmonic current amplitude curve, a voltage amplitude-voltage same-phase fundamental current amplitude curve and a voltage amplitude-voltage vertical fundamental current amplitude curve from the environmental temperature characteristic curve cluster in the step 2 in a line interpolation mode according to the environmental temperature in the step 3.
And 5, acquiring remote asynchronous measurement voltage and calculating a current characteristic value. Obtaining non-synchronous measurement voltage of corresponding line at transformer station side, including fundamental voltage amplitude U1mAnd third harmonic voltage amplitude U3m. According to fundamental voltage amplitude U1mRespectively obtaining the third harmonic current amplitude I from the voltage amplitude-third harmonic current amplitude curve, the voltage amplitude-voltage in-phase fundamental current amplitude curve and the voltage amplitude-voltage vertical fundamental current amplitude curve in the step 4 by a linear interpolation method3m_r、I1m_r、I1m_c。
And 6, calculating the resistive current components of the fundamental wave and the third harmonic of the line arrester.
And (5) calculating resistive current components of fundamental waves and third harmonics by using the 5 current amplitudes in the step (3) and the step (5).
Fundamental wave resistive current component I'1m_rThe calculation formula of (2) is as follows:
third harmonic resistive current component I'3m_rThe formula for calculating (a) is as follows,
I'3m_r＝|I3m-3·I1m_c·U3m/U1m|；
and 7, setting a criterion variable and a threshold value thereof and diagnosing the running state of the line arrester.
Setting a criterion variable K as:
in the embodiment of the invention, a line arrester manufacturer sets a criterion variable threshold value as K according to operation experience1，K2(K1<K2) When K is<K1When the line arrester is in a normal state, the line arrester is diagnosed; when K is1≤K<K2When the current is over; diagnosing the line arrester as a fault early warning state; when K is>K2When the current is over; the line arrester is diagnosed as a fault condition.
In the embodiment of the invention, a small amount of easily-measured experimental data are utilized to form a normal operation characteristic curve cluster of the line arrester, namely, third harmonic current, fundamental resistive current and fundamental capacitive current under different voltages and different temperatures. And voltage is measured asynchronously relative to current, only fundamental wave and third harmonic voltage components are extracted, fundamental wave current and third harmonic current normal values corresponding to the voltage are calculated according to a normal operation characteristic curve and capacitance characteristics, and fundamental wave resistive current and third harmonic resistive current are estimated by combining current measurement values, so that the state diagnosis of the line arrester is realized. In the embodiment of the invention, the experimental data volume is reduced, and all experimental data can be acquired by using simple experimental equipment. Synchronous voltage sampling is not needed, and the requirement on a collecting device is reduced. Meanwhile, the influence of voltage and environment temperature is considered, and the anti-interference performance of the power grid and the environment under the background of influence is improved.
The online monitoring and diagnosing system for the state of the line arrester comprises:
the fundamental voltage characteristic curve acquisition module is used for acquiring a fundamental voltage characteristic curve of the line arrester through experiments; the fundamental voltage characteristic curve includes: a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve;
the system comprises an ambient temperature characteristic curve cluster acquisition module, a line arrester and a control module, wherein the ambient temperature characteristic curve cluster acquisition module is used for acquiring an ambient temperature characteristic curve cluster of the line arrester through experiments;
the running state evaluation module is used for monitoring and measuring the total leakage current and the ambient temperature of the line arrester running on line, carrying out Fourier decomposition on the total leakage current to obtain fundamental wave current and third harmonic current, and the amplitudes are I respectively1mAnd I3m(ii) a Obtaining a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve from an ambient temperature characteristic curve cluster according to the monitored and measured ambient temperature in a line interpolation mode; the method for obtaining the asynchronous measurement voltage of the corresponding line on the transformer substation side comprises the following steps: fundamental voltage amplitude U1mAnd third harmonic voltage amplitude U3m(ii) a According to fundamental voltage amplitude U1mRespectively obtaining a third harmonic current amplitude I by linear interpolation from the voltage amplitude and third harmonic current amplitude curve, the voltage amplitude and voltage in-phase fundamental current amplitude curve and the voltage amplitude and voltage vertical fundamental current amplitude curve obtained in the step 43m_r、I1m_r、I1m_c(ii) a Calculating resistive current components of fundamental waves and third harmonics by using the 5 current amplitudes; wherein, the fundamental wave resistive current component I'1m_rThe calculation expression of (a) is:
third harmonic resistive current component I'3m_rThe calculation expression of (a) is:
I'3m_r＝|I3m-3·I1m_c·U3m/U1m|；
setting a criterion variable and a threshold value thereof and diagnosing the running state of the line arrester; wherein, the expression of the set criterion variable K is as follows:
in an embodiment of the present invention, the fundamental voltage characteristic curve obtaining module includes:
the voltage application measurement module is used for applying fundamental voltage to the line arrester and synchronously measuring the voltage and the total leakage current;
the current acquisition module is used for carrying out Fourier decomposition on the full leakage current to obtain fundamental current and third harmonic current;
and the curve acquisition module is used for decomposing the fundamental wave current into voltage in-phase fundamental wave current and voltage vertical fundamental wave current to obtain a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage in-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
In an embodiment of the present invention, the ambient temperature characteristic curve cluster obtaining module includes:
the temperature point value acquisition module is used for selecting a plurality of temperature point values within the temperature range of the line operating environment;
and the curve cluster acquisition module is used for setting the experimental environment temperature as a selected temperature point value, repeatedly executing the fundamental wave voltage characteristic curve acquisition module, and acquiring an environment temperature characteristic curve cluster of a voltage amplitude and third harmonic wave current amplitude curve, a voltage amplitude and voltage same-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (9)
1. An online monitoring and diagnosing method for the state of a line arrester is characterized by comprising the following steps:
step 1, acquiring a fundamental voltage characteristic curve of a line arrester through an experiment; the fundamental voltage characteristic curve includes: a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve;
step 2, acquiring an ambient temperature characteristic curve cluster of the line arrester through an experiment;
step 3, monitoring and measuring the total leakage current and the ambient temperature of the online operating line arrester, performing Fourier decomposition on the total leakage current to obtain fundamental wave current and third harmonic current with amplitudes I1mAnd I3m；
Step 4, obtaining a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve from the environmental temperature characteristic curve cluster in the step 2 in a line interpolation mode according to the environmental temperature in the step 3;
step 5, obtaining the asynchronous measurement voltage of the corresponding line on the transformer substation side, comprising: fundamental voltage amplitude U1mAnd third harmonic voltage amplitude U3m(ii) a According to fundamental voltage amplitude U1mRespectively obtaining a third harmonic current amplitude I by linear interpolation from the voltage amplitude and third harmonic current amplitude curve, the voltage amplitude and voltage in-phase fundamental current amplitude curve and the voltage amplitude and voltage vertical fundamental current amplitude curve obtained in the step 43m_r、I1m_r、I1m_c；
Step 6, calculating resistive current components of fundamental waves and third harmonics by using the 5 current amplitudes obtained in the step 3 and the step 5; wherein, the fundamental wave resistive current component I'1m_rThe calculation expression of (a) is:
third harmonic resistive current component I'3m_rThe calculation expression of (a) is:
I'3m_r＝|I3m-3·I1m_c·U3m/U1m|；
step 7, setting criterion variables and threshold values thereof and diagnosing the operation state of the line arrester; wherein, the expression of the set criterion variable K is as follows:
2. the online monitoring and diagnosing method for the state of the line arrester as claimed in claim 1, wherein the step 1 specifically comprises:
step 1.1, fundamental voltage is applied to a line arrester, and voltage and total leakage current are synchronously measured;
step 1.2, carrying out Fourier decomposition on the full leakage current to obtain fundamental current and third harmonic current;
and 1.3, decomposing the fundamental wave current into voltage in-phase fundamental wave current and voltage vertical fundamental wave current to obtain a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage in-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
3. The method for on-line monitoring and diagnosing the state of the line arrester as claimed in claim 2, wherein in step 1.1, the variation range of the voltage amplitude of the applied fundamental voltage includes the allowable variation range of the voltage amplitude of the grid voltage.
4. The method for on-line monitoring and diagnosing the state of the line arrester as claimed in claim 1, wherein the step 2 specifically comprises:
selecting a plurality of temperature point values within the temperature range of the line operation environment, setting the experiment environment temperature as the selected temperature point values, and repeatedly executing the step 1 to obtain an environment temperature characteristic curve cluster of a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve.
5. The method as claimed in claim 4, wherein the temperature values are selected at equal intervals when the temperature values are selected within the operating environment temperature range of the line.
6. The method for on-line monitoring and diagnosing the state of the line arrester as claimed in claim 1, wherein in step 7, a criterion variable threshold is set to K1，K2，K1<K2(ii) a When K is<K1When the line arrester is in a normal state, the line arrester is diagnosed; when K is1≤K<K2Then, the line arrester is diagnosed to be in a fault early warning state; when K is>K2The line arrester is diagnosed as a fault condition.
7. An on-line monitoring and diagnostic system for the status of a line arrester, comprising:
the fundamental voltage characteristic curve acquisition module is used for acquiring a fundamental voltage characteristic curve of the line arrester through experiments; the fundamental voltage characteristic curve includes: a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve;
the system comprises an ambient temperature characteristic curve cluster acquisition module, a line arrester and a control module, wherein the ambient temperature characteristic curve cluster acquisition module is used for acquiring an ambient temperature characteristic curve cluster of the line arrester through experiments;
the running state evaluation module is used for monitoring and measuring the total leakage current and the ambient temperature of the line arrester running on line, carrying out Fourier decomposition on the total leakage current to obtain fundamental wave current and third harmonic current, and the amplitudes are I respectively1mAnd I3m(ii) a From the ambient temperature characteristic curve cluster, in lines, according to the ambient temperature monitored and measuredA path interpolation mode is adopted to obtain a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage same-phase fundamental current amplitude curve and a voltage amplitude and voltage vertical fundamental current amplitude curve; the method for obtaining the asynchronous measurement voltage of the corresponding line on the transformer substation side comprises the following steps: fundamental voltage amplitude U1mAnd third harmonic voltage amplitude U3m(ii) a According to fundamental voltage amplitude U1mRespectively obtaining a third harmonic current amplitude I by linear interpolation from the voltage amplitude and third harmonic current amplitude curve, the voltage amplitude and voltage in-phase fundamental current amplitude curve and the voltage amplitude and voltage vertical fundamental current amplitude curve obtained in the step 43m_r、I1m_r、I1m_c(ii) a Calculating resistive current components of fundamental waves and third harmonics by using the 5 current amplitudes; wherein, the fundamental wave resistive current component I'1m_rThe calculation expression of (a) is:
third harmonic resistive current component I'3m_rThe calculation expression of (a) is:
I'3m_r＝|I3m-3·I1m_c·U3m/U1m|；
setting a criterion variable and a threshold value thereof and diagnosing the running state of the line arrester; wherein, the expression of the set criterion variable K is as follows:
8. the system for on-line monitoring and diagnosing the state of the line arrester as claimed in claim 7, wherein the fundamental voltage characteristic curve acquiring module comprises:
the voltage application measurement module is used for applying fundamental voltage to the line arrester and synchronously measuring the voltage and the total leakage current;
the current acquisition module is used for carrying out Fourier decomposition on the full leakage current to obtain fundamental current and third harmonic current;
and the curve acquisition module is used for decomposing the fundamental wave current into voltage in-phase fundamental wave current and voltage vertical fundamental wave current to obtain a voltage amplitude and third harmonic current amplitude curve, a voltage amplitude and voltage in-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
9. The system for on-line monitoring and diagnosing the state of the line arrester as claimed in claim 7, wherein the ambient temperature characteristic curve cluster acquiring module comprises:
the temperature point value acquisition module is used for selecting a plurality of temperature point values within the temperature range of the line operating environment;
and the curve cluster acquisition module is used for setting the experimental environment temperature as a selected temperature point value, repeatedly executing the fundamental wave voltage characteristic curve acquisition module, and acquiring an environment temperature characteristic curve cluster of a voltage amplitude and third harmonic wave current amplitude curve, a voltage amplitude and voltage same-phase fundamental wave current amplitude curve and a voltage amplitude and voltage vertical fundamental wave current amplitude curve.
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| CN202010357706.9A CN111505420B (en) | 2020-04-29 | 2020-04-29 | Online monitoring and diagnosing method and system for state of line arrester |
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Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004063763A (en) * | 2002-07-29 | 2004-02-26 | Meidensha Corp | Method for manufacturing voltage nonlinear resistor |
| CN102023264A (en) * | 2009-09-22 | 2011-04-20 | 华东电力试验研究院有限公司 | Method for monitoring state of metal oxide lightning arrester |
| CN102621457A (en) * | 2012-03-13 | 2012-08-01 | 福建省电力有限公司莆田电业局 | On-line detection method of metal oxide arrester insulating property influencing factor |
| CN104459280A (en) * | 2014-12-19 | 2015-03-25 | 南京信息工程大学 | Method for extracting resistance current of metal oxide arrester (MOA) |
| CN105044437A (en) * | 2015-08-07 | 2015-11-11 | 南方电网科学研究院有限责任公司 | Method for measuring resistive current of metal oxide lightning arrester |
| CN105044524A (en) * | 2015-08-10 | 2015-11-11 | 许继集团有限公司 | Lightning arrester monitoring method applicable to intelligent transformer station and system |
| CN105158552A (en) * | 2015-08-26 | 2015-12-16 | 芜湖市凯鑫避雷器有限责任公司 | Zinc oxide arrester leakage current monitoring system |
| CN205229328U (en) * | 2015-11-18 | 2016-05-11 | 武汉大学 | Off -line zinc oxide arrester tester |
| CN205374588U (en) * | 2015-12-22 | 2016-07-06 | 海南电力技术研究院 | Leakage current collection system |
| CN105785171A (en) * | 2016-03-07 | 2016-07-20 | 清华大学 | Method for determining aging state of ZnO voltage-sensitive resistor disc according to higher harmonic characteristic of leakage current |
| CN106018998A (en) * | 2016-05-12 | 2016-10-12 | 广东电网有限责任公司电力科学研究院 | Lightning arrester test method and lightning arrester test system |
| CN106526383A (en) * | 2016-11-24 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Lightning arrester state monitoring system and lightning arrester state monitoring method |
| CN106526401A (en) * | 2016-11-28 | 2017-03-22 | 唐恩(厦门)电气有限公司 | Distributed lightning arrester online monitoring system |
| CN106646051A (en) * | 2016-12-27 | 2017-05-10 | 中国西电电气股份有限公司 | Lightning arrester testing device and lightning arrester testing method |
| CN106771904A (en) * | 2016-11-30 | 2017-05-31 | 中国电力科学研究院 | A kind of system and method for carrying out impact test to controllable arrester in extra-high voltage environment based on sequential |
| CN106950455A (en) * | 2017-05-17 | 2017-07-14 | 镇江华源晋昌电器有限公司 | A kind of series capacitor compensation lightning arrester monitoring device |
| CN107167693A (en) * | 2017-05-24 | 2017-09-15 | 广东电网有限责任公司电力科学研究院 | A kind of resistive current of gapless metal-oxide lighting arrester inversion method and device |
| CN206740896U (en) * | 2016-11-28 | 2017-12-12 | 唐恩(厦门)电气有限公司 | A kind of distributed arrester on-line monitoring system |
| CN109030978A (en) * | 2018-06-02 | 2018-12-18 | 国网江苏省电力有限公司连云港供电分公司 | A kind of arrester health condition judging method based on VA characteristic curve analysis |
| CN109633384A (en) * | 2018-11-29 | 2019-04-16 | 湖南长高思瑞自动化有限公司 | A kind of Intelligent insulating line thunder protection on-Line Monitor Device and method |
-
2020
- 2020-04-29 CN CN202010357706.9A patent/CN111505420B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004063763A (en) * | 2002-07-29 | 2004-02-26 | Meidensha Corp | Method for manufacturing voltage nonlinear resistor |
| CN102023264A (en) * | 2009-09-22 | 2011-04-20 | 华东电力试验研究院有限公司 | Method for monitoring state of metal oxide lightning arrester |
| CN102621457A (en) * | 2012-03-13 | 2012-08-01 | 福建省电力有限公司莆田电业局 | On-line detection method of metal oxide arrester insulating property influencing factor |
| CN104459280A (en) * | 2014-12-19 | 2015-03-25 | 南京信息工程大学 | Method for extracting resistance current of metal oxide arrester (MOA) |
| CN105044437A (en) * | 2015-08-07 | 2015-11-11 | 南方电网科学研究院有限责任公司 | Method for measuring resistive current of metal oxide lightning arrester |
| CN105044524A (en) * | 2015-08-10 | 2015-11-11 | 许继集团有限公司 | Lightning arrester monitoring method applicable to intelligent transformer station and system |
| CN105158552A (en) * | 2015-08-26 | 2015-12-16 | 芜湖市凯鑫避雷器有限责任公司 | Zinc oxide arrester leakage current monitoring system |
| CN205229328U (en) * | 2015-11-18 | 2016-05-11 | 武汉大学 | Off -line zinc oxide arrester tester |
| CN205374588U (en) * | 2015-12-22 | 2016-07-06 | 海南电力技术研究院 | Leakage current collection system |
| CN105785171A (en) * | 2016-03-07 | 2016-07-20 | 清华大学 | Method for determining aging state of ZnO voltage-sensitive resistor disc according to higher harmonic characteristic of leakage current |
| CN106018998A (en) * | 2016-05-12 | 2016-10-12 | 广东电网有限责任公司电力科学研究院 | Lightning arrester test method and lightning arrester test system |
| CN106526383A (en) * | 2016-11-24 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Lightning arrester state monitoring system and lightning arrester state monitoring method |
| CN106526401A (en) * | 2016-11-28 | 2017-03-22 | 唐恩(厦门)电气有限公司 | Distributed lightning arrester online monitoring system |
| CN206740896U (en) * | 2016-11-28 | 2017-12-12 | 唐恩(厦门)电气有限公司 | A kind of distributed arrester on-line monitoring system |
| CN106771904A (en) * | 2016-11-30 | 2017-05-31 | 中国电力科学研究院 | A kind of system and method for carrying out impact test to controllable arrester in extra-high voltage environment based on sequential |
| CN106646051A (en) * | 2016-12-27 | 2017-05-10 | 中国西电电气股份有限公司 | Lightning arrester testing device and lightning arrester testing method |
| CN106950455A (en) * | 2017-05-17 | 2017-07-14 | 镇江华源晋昌电器有限公司 | A kind of series capacitor compensation lightning arrester monitoring device |
| CN107167693A (en) * | 2017-05-24 | 2017-09-15 | 广东电网有限责任公司电力科学研究院 | A kind of resistive current of gapless metal-oxide lighting arrester inversion method and device |
| CN109030978A (en) * | 2018-06-02 | 2018-12-18 | 国网江苏省电力有限公司连云港供电分公司 | A kind of arrester health condition judging method based on VA characteristic curve analysis |
| CN109633384A (en) * | 2018-11-29 | 2019-04-16 | 湖南长高思瑞自动化有限公司 | A kind of Intelligent insulating line thunder protection on-Line Monitor Device and method |
Non-Patent Citations (1)
| Title |
|---|
| 云晓春: "金属氧化物避雷器在线监测技术比较", 《信息与电脑(理论版)》 * |
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